# BCM62B

**Nexperia** · Bipolar Transistors - BJT · SOT-143

BCM62B from Nexperia, in a SOT-143. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | C2/B1/B2 | passive | Collector of TR2 and base of both TR1 and TR2 (common node); TR2 is diode-connected for current-mirror use. |
| 2 | C1 | passive | Collector of TR1; limits VCEO -45 V, VCBO -50 V, IC max -100 mA per transistor. |
| 3 | E1 | passive | Emitter of TR1. |
| 4 | E2 | passive | Emitter of TR2; VEBS limit -5 V per transistor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-143 |
| Category | Triode/MOS Tube/Transistor |
| Pins | 4 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-base voltage (open emitter) | VCBO |  |  | -50 | V | open emitter | 3 |
| Collector-emitter voltage (open base) | VCEO |  |  | -45 | V | open base | 3 |
| Emitter-base voltage (TR1) | VEBS |  |  | -5 | V | VCB = 0 V | 3 |
| Collector current | IC |  |  | -100 | mA | per transistor | 3 |
| Peak collector current | ICM |  |  | -200 | mA | single pulse; tp ≤ 1 ms | 3 |
| Total power dissipation (per transistor) | Ptot |  |  | 220 | mW | Tamb ≤ 25 °C | 3 |
| Total power dissipation (per device) | Ptot |  |  | 390 | mW | Tamb ≤ 25 °C | 3 |
| Junction temperature | Tj |  |  | 150 | °C |  | 3 |
| Ambient temperature | Tamb | -65 |  | 150 | °C |  | 3 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| Thermal resistance junction to ambient (per transistor) | Rth(j-a) |  |  | 568 | K/W | in free air; device mounted on FR4 PCB | 3 |
| Thermal resistance junction to ambient (per device) | Rth(j-a) |  |  | 321 | K/W | in free air; device mounted on FR4 PCB | 3 |
| Collector-base cut-off current | ICBO |  |  | -15 | nA | VCB = −30 V; IE = 0 A | 4 |
| Collector-base cut-off current (Tj = 150 °C) | ICBO |  |  | -5 | µA | VCB = −30 V; IE = 0 A; Tj = 150 °C | 4 |
| Emitter-base cut-off current | IEBO |  |  | -100 | nA | VEB = −5 V; IC = 0 A | 4 |
| DC current gain | hFE | 100 |  |  | - | VCE = −5 V; IC = −100 µA | 4 |
| DC current gain | hFE | 200 | 290 | 450 | - | VCE = −5 V; IC = −2 mA | 4 |
| Collector-emitter saturation voltage | VCEsat |  | -50 | -200 | mV | IC = −10 mA; IB = −0.5 mA | 4 |
| Collector-emitter saturation voltage | VCEsat |  | -200 | -400 | mV | IC = −100 mA; IB = −5 mA | 4 |
| Base-emitter voltage | VBE | -600 | -650 | -700 | mV | VCE = −5 V; IC = −2 mA | 4 |
| Base-emitter voltage | VBE |  |  | -760 | mV | VCE = −5 V; IC = −10 mA | 4 |
| Collector capacitance | Cc |  |  | 2.2 | pF | VCB = −10 V; IE = ie = 0 A; f = 1 MHz | 4 |
| Transition frequency | fT | 100 | 175 |  | MHz | VCE = −5 V; IC = −10 mA; f = 100 MHz | 4 |
| Emitter-base voltage (TR2) | VEBS |  |  | 1.5 | V | VCB = 0 V; IE = 250 mA | 5 |
| Emitter-base voltage (TR2) | VEBS | 400 |  |  | mV | VCB = 0 V; IE = 10 µA | 5 |
| Current matching IC1/IE2 | IC1/IE2 | 1 | 1.1 | 1.2 |  | VCE1 = −5 V; IE2 = 0.5 mA; Tamb ≤ 25 °C | 5 |
| Current matching IC1/IE2 | IC1/IE2 | 1.02 |  | 1.22 |  | VCE1 = −5 V; IE2 = 0.5 mA; Tamb ≤ 150 °C | 5 |
| Current matching IC1/IE2 | IC1/IE2 | 0.95 | 1.05 | 1.15 |  | VCE1 = −3 V; IE2 = 0.5 mA; Tamb ≤ 25 °C | 5 |
| Current matching IC1/IE2 | IC1/IE2 | 0.9 | 1 | 1.1 |  | VCE1 = −1 V; IE2 = 0.5 mA; Tamb ≤ 25 °C | 5 |

## CAD (KiCad official)

- Symbol: `BCM62B`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `bcm62b-etched.step` / `bcm62b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcm62b.step` / `bcm62b.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/BCM62B.pdf) (13 pp, sha256 `552ef3be9f13491a`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/bcm62b-datasheet.pdf)